Doubt its the chip. A little more timing, locks the converter earlier, fans come on earlier thats it. You have a problem somewhere else.
1989 Corvette with hypertech power chip
Thread Starter
Cruising
Joined: Apr 2007
Posts: 12
Likes: 0
1989 Corvette with hypertech power chip
Hi
I own a 1989 convert and i put a hypertech chip in a couple years
ago i like the fact that the temp is cooler the fans come on at 210
and shifts a bit better but i just put a true dual off road exhaust kit on
and holly cows this car stinks!!!!
The car is burning way rich.
My question is can a chip make your car burn way rich like that
man my tail pipes are so black!!
Thanks!!
I own a 1989 convert and i put a hypertech chip in a couple years
ago i like the fact that the temp is cooler the fans come on at 210
and shifts a bit better but i just put a true dual off road exhaust kit on
and holly cows this car stinks!!!!
The car is burning way rich.
My question is can a chip make your car burn way rich like that
man my tail pipes are so black!!
Thanks!!
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Did you relocate where the O2 sensor sits? (Wonder if it thinks it's leaner -- and is sending more fuel?)
Or maybe something is keeping it from going closed loop?
I've even read (here) where Hypertechs were just altered for a couple minor mods like fans. So, your stock chip might even do the same thing.
Or maybe something is keeping it from going closed loop?
I've even read (here) where Hypertechs were just altered for a couple minor mods like fans. So, your stock chip might even do the same thing.
Last edited by GREGGPENN; Jul 27, 2008 at 04:57 PM.
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Thread Starter
Cruising
Joined: Apr 2007
Posts: 12
Likes: 0
The O2 sensor is in the same spot as the stock.
I will put the stock chip in this weekend.
This system is without cats, so if cats keep the smell down
That much I guess I will have to save up some green and go
back to stock.
If I go back to stock do I need the precats or is the one in the middle good enough?
Thanks!!
I will put the stock chip in this weekend.
This system is without cats, so if cats keep the smell down
That much I guess I will have to save up some green and go
back to stock.
If I go back to stock do I need the precats or is the one in the middle good enough?
Thanks!!
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
The O2 sensor is in the same spot as the stock.
I will put the stock chip in this weekend.
This system is without cats, so if cats keep the smell down
That much I guess I will have to save up some green and go
back to stock.
If I go back to stock do I need the precats or is the one in the middle good enough?
Thanks!!
I will put the stock chip in this weekend.
This system is without cats, so if cats keep the smell down
That much I guess I will have to save up some green and go
back to stock.
If I go back to stock do I need the precats or is the one in the middle good enough?
Thanks!!
If you get it running with correct A/F ratio, it shouldn't smell too bad. But a CAT is a good choice -- if you don't have one and need sound reduction.
I agree cats have no bearing on A/F ratio. Since you didn't move the O2 sensor, you're probably just smelling the exhaust w/o the CATs.
You only need front cats if your center CAT is NOT a 3-way CAT and you want to comply to emissions. CA may be more strict and require you keep original config. That I don't know.
BTW: How did you determine it's running rich?
If it's like my car, I had two suspect injectors on the driver's bank. Because they were lean, the ECM told all injectors to squirt more gas. So, the 6 good injectors were overdriven. Remove the CATs in this situation and you have your answer.
W/O any codes, try checking injector resistance. You won't have to look hard if you don't know how. Threads are all over on the subject. One (with video) should be within a day/two of the top in C4 tech.
Last edited by GREGGPENN; Jul 29, 2008 at 06:37 PM.
Thread Starter
Cruising
Joined: Apr 2007
Posts: 12
Likes: 0
Correct, factory manifolds, its the offroad dual from kit from cc
I know it was going to smell a bit, but not this bad and the drown is bad too.
The car runs great i just thought i would save a buck with the catless
set up all I know is the wife hates it!!!!!
I know it was going to smell a bit, but not this bad and the drown is bad too.
The car runs great i just thought i would save a buck with the catless
set up all I know is the wife hates it!!!!!
Team Owner
Joined: Jul 2004
Posts: 28,429
Likes: 3,278
From: Hartford WI
Why don't you just go with a set of TPIS Long Tube headers and eliminate the pre-cats.
